Machine for sawino stone



(No Model.) s Sheets-Sheet 1.

E. FORESTER.

MACHINE PORSAWING'STONE. No. 340.205. Patented Apr. 20, 1886.

Afro/MUS N- PEYERSrPhMo-Lilhognpher. Wahinglvn. D. G

(No Model.) 3 Sheets-Sheet 2'.

E. FOERSTER.

, MACHINE FOR SAWING STONE.

" PatentedApr. 20,1886.

WITNESSES:

BY (2 i;

Arm/wins, v I

(No Model.) s Sheeias-Sheet 3.

E. FOERSTER.

UMAGHINETOR SAWING STONE.

Patented Apr. 20, 1886.

WITNESSES //V I/E/VTOR ATTORNEYS.

llai'ren same EMANUEL FOERSTER,

PATENT Grates.

or NEW YORK, N. 'Y.

MACHINE FOR SAWING STONE.

EPEGEEIEGATEQN forming part of Letters Patent No. 340,205, dated April 20, 1886.

Application filed October-'22, 1885.

To all whom it may concern.-

Be it known that I, EMANUEL Fonnsrnn, of the city, county, and State of NewYork, have invented certain new and useful Improve meats in Machines for Sawing Stone, of which the following is a specification.

This invention relates to machines for sawing stone, in which saws armed with diamonds or other hard stones are used as cutting-tools; and the invention consists of a machine for sawing stone, in which a-reciprocating sash that supports the saw-blade is raised by suitable mechanism at the end of each stroke and lowered at the beginning of the next stroke, so that the kerf can be cleared of debris, while the saw exerts a cutting action both on the forward and return stroke.

The invention consists, further, ofa mechanism for feeding the saw-blade forward at the end of each stroke and ofa novel construction of sash, as will be more fully described hereinafter, and finally pointed out in the claims.

In the accompanying drawings, Figure 1 represents a side elevation of my improved machine for sawing stone, showing it connected to the driving mechanism. Fig. 2 is a vertical longitudinal section of the same, drawn on a larger scale. Fig. 3 is a plan, partly in section. Fig. 4 is a vertical transverse sec tion of the same on line :0 at, Fig. 3; and Fig. 5 is an end elevation of the mechanism by which reciprocating and vertical up and down motion is imparted to the saw blade and its sash.

Similar letters of reference indicate corresponding parts.

A in the drawings represents a saw-blade, which is supported in the usual manner by a sash, B. The saw-blade A is mounted with a number of teeth having diamonds inserted therein in any approved manner. The sash B receives reciprocating motion bya pitman, B, from a driving crankshaft, 0, Fig. 1. The sash B is supported by rollers b b on horizontal ways d d of the supportingframe D of the machine,and guided by cushions d of said ways, which cushions steady the sash and prevent lateral vibrations of the same. The rollers b b are provided with toothed eccentric flanges b b, which engage racks b of the ways d. The eccentric portions of the toothed Serial No. 180,562. (No modeLl flanges b b are so arranged that when the sash arrives near to the end ofeach stroke it is lifted by the eccentricity of the flanges sufficiently to withdraw the blade from the kerf of the stone and permit the debris to be washed away by the water supplied to the kerf. At the beginning of the next stroke the sash and its bladeis lowered again.

In place of the toothed eccentric flanges smooth eccentric flanges may be used, which are guided in smooth grooves of the ways d, or any other equivalent mechanism maybe used by which the saslri'rame with the saw is lifted when arriving nearly at the end of its stroke. The ways (I and the circumference of the toothed eccentric flanges are equal in length to the length of the stroke of the saw-blade.

The sash B is made of the usual construction in stone-sawing machines, the sides of the sash being extended downward and con-,

nected at their lower ends by a longitudinal stiHening-piecaB' which extends transversely below the track on which the stonesupporting carriage is placed, and which serves for imparting greater rigidity to the sash, so as to givea better support for the saw-blade and diminish the longitudinal vibrations of the same.

The saw-blade is adjusted by traversing screw-nuts f at both ends on' vertical screwrods F,that turn in bearings at the upper and lower parts of the sash. The screw-rods F are provided with bevel-wheels f at the upper ends, which mesh with bevel-wheels fflthat are applied to the opposite ends of a hollow shaft, f having a longitudinal opening of square cross-section. A transmittingshaft, f, of square cross-section, is extended through the hub of one bevel-wheehf", into the hollow shaftf the shaft meshing by abevelwheel, f at its end, with a bevel-wheel, f", of a tranverse shaft, f. The tubular shaft f is supported in bearings g of the shaft B at the top part of the sash B, and moved along with the same so as to slide along the square shaft f? by the reciprocating motion of the sash. A sidewise projecting lug,'h, is attached to the top part of the sash B, and serves to engage the downwardly-bent end of a horizontally-guided and spring-actuated rod, h, which is provided at its opposite end with a spring-pawl, h", that engages a-ratchet-wheel,

h, on theshaftf, as shown in Figs. 2.and 3.

A second spring-actuated pawl, 71., engages the,

allyadvanced into the kerf of the stone as the same is dispensed by the cutting action of the saw.

An inclined shaft, F, is supported insuitable bearings and provided at the upper end with a bevel-wheel, t, that meshes with the bevel-wheel f on the shaft f; A bevelwheel, '5, at the lower end of the shaft F, meshes with bevel-wheels 1' on a countershaft, F?, that turnsin bearingsbelow the support for the driving crank-shaft G, as shown in Figs. 1 and 5.

Rotary motion is imparted to the shaft 'F by a belt and pulley transmission whenever theblade is to he raised or lowered while the sash is at rest by a lever and belt-shifting device, (not shown in the drawings) as customary in stone-sawing machines. Inthis man ner the saw-blade can be quickly set inproper position to the work.

The operation of the machine is as follows: When the block of stone has been placed in position on its carriage, the blade is adjusted inproper position thereto by the shaft Fand its transniittinggearing. The driving-shaft is then started, so that the sash commences its stroke. When arriving nearly at the end of the forward stroke, it is lifted by the toothed eccentric flanges of the rollers, so as to clear the kerf sufficiently for removing the debris. The saw commences then its returnstroke and is lowered again intothe .kerf, exerting a cutting action thereon until it arrives nearly at the end of its returnstroke, when it is lifted again to giveaclearance for the removal of the debris. At the end of each stroke the blade is fed forward by the alternating action of the pawls h h on the ratchet-wheel h By lifting the saw at the endof each stroke and lowering the same at the beginning of'the next stroke, and by imparting a forward feed to the saw at each end of the stroke, the saw exerts a cutting action during the forward stroke and return-stroke, and accomplishes therebythe sawing of the stone in a quicker and more effective manner than when the sawis lifted from the kerf and moved clear of the same during the entire return-stroke,as heretofore.

I am aware that machines for sawing stones have been used in which thesaw receives during its longitudinal motion through the kerf a series of ascending and descending movements between the commencement and termination of its stroke, so as to supply a new quantity of sand, which, however, is not required in diamond-cutting machines, as

these are Worked without feeding sand into 'thekerf in front of the cutting-edge of the blade. My construction differs therefrom inasmuch as the ascending and descending movements of the saw take place near the end of one-stroke and at the beginning of the next stroke, so that the saw cuisin both directions without being lifted from the kerf while passingthrough its longitudinal motion in either direction.

Having thus described my invention,I claim as new and desire to secure by Letters Patent- .1. The combinatiomin astonc-sawing machine, of a reciprocating sash, a saw-blade provided with diamonds carried by said sash, and mechanism, substantially -:as described, for imparting successively a positive lifting and a lowering movement to thesashat or near the ends of each stroke, and a continuous rectilinear movement between the lowering movement at one end of the stroke and the'lifting movement atthe opposite end of the same stroke.

2. The combin'ati'oinin a machine for sawing'stone, of a reciproeatingsash, a saw-blade provided with diamonds carried by said sash, longitudinally'grooved guideways, rollers on said guideways supporting said sash, provided with eccentric flanges for'imparting successively a lifting and a lowering movementto the sash at or near the ends ot'eaeh stroke,and devices,substantially as described, for imparting a continuous rectilinear movement to said sash between the lowering movement at one end ofthe stroke and .the lifting movement atthe opposite end of the same stroke.

3. The combination of a reciprocating sash, a saw-blade having transverse screw-nuts, vertical screw-nuts, a hollow tubular shaft, bevel-gears connecting said shaft with the screwrods, a square transmitting-shaft extending into said tubular shaft, a ratchetwheel, spring-pawls engagingsaid ratchetwheel, and being alternately actuated by the sash, and transmitting bevel-wheels between the ratchet-wheel and tubular shaft, substantiall y as set forth.

4. The combination of a reciprocating sash, a saw-blade having nuts at both ends, vertical screw-rods, transmitting bevel-gears, a tubular shaft turning in bearings of the sash, a square transmittingshaft extending into said tubular shaft, transmitting bevel-wheels, a ratchet-wheel on the shaftof one ofwsaid bevel-wheels, a guided and spring-actuated rod having a spring pawl engaging said ratchet-wheel, a lug on the sashengaging said rod, and a spring-pawl,also engaging the ratchet-wheel,whereby the saw is fed forward at the end .of each stroke, substantiallytas 5. In a machine for sawing stone, a sash my invention I have signed my name in preshaving downwardly-extending sides and a ence of two subscribing witnesses. longitudinal brace connecting the lower ends EMANUEL FOERSTER of said sides below the stone-supporting 5 carriage and its track, substantially as set Witnesses:

forth. PAUL GOEPEL,

In testimony that I claim the foregoing as CARL KARP. 

